Pump



Aug 11 193E. J. v. FETRELLE 1,313,097

I PUMP Filed Sept. 28, 1929 2 Sheets-Sheet 1 ii -i 36 Patented Aug. 11, 1931 PATENT OFFICE JOSEPH V. PETRELLI, F NEN ROCHELLE, HEX/V YORK PUMP Application filed September 28, 1929. Serial N0. 395,832.

My invention relates to pumps of the rotary type, designed for handling a great var ety of fluids and especially liquids.

The general purpose of the invention is to provide a pump of simple and economical structure which is practically positive in action, will lift a liquid at long distance from the supply point without necessity for priming, and deliver liquid positively at low, in-

termediatc and high speeds and against high back'pressure, and will run a long time withoutperceptible wear.

A more particular object is to provide a pump of the general rotary type in which the only revolving element is essentially a simple pocketed cylinder cooperating with nonrotary means including a movable vane and a sealing or abutment device. Since the vane and abutment or sealing device do not revolve they are free from the eifects of centrifugal forces, and wear and other disturb ances or disadvantages peculiar to pumps having rotary vanes, abutments or similar devices are entirely avoided.

Afurther object is to provide in a pump of this class. a suitable by-pass or relief valve, which. relieves the pump of excessive load in case of unduly high back pressure.

The accompanying drawings show certain representative embodiments of the invention.

After considering these examples, skilled persons will understand that many variations may be made, and I contemplate the employment of any structures that are properly within the scope of the appended claims.

In the drawings:

Fig. 1 is a front elevation of a pump embodying the invention in one form.

Fig. 2 is a section at 2-2, Fig. 1.

Fig. 3 is a section at 33, Fig. 4.

F ig. 4: is a section at 4-4, Fig. 3.

Fig. 5 is a perspective view of the sealing element or vane abutment.

F ig. 6 is a similarview of the vane.

Fig. 7 is a fragmentary elevation of the inner face of the cover plate and parts there- Fig. 8 is a front elevation of a modified 50 structure, the modifications relating principally to the by-pass or relief valve structure or arrangement.

Fig. 9 is a section at 99, Fig. 10.

Fig. 10 is a section at l010, Fig. 8.

Referring first to Figs. 1 to 7 I A cylindrical casing 10 has at one side, a central extension 11 bored to provide a bearing for a shaft 12. At the end of the extension or hearing sleeve 11 is suitable packing means, including packing 13 in a counter-bore of the extension, a gland 14 to compress the packing, a nut 15 having an internal thread engaging athread on the bearing sleeve to set up the gland against the packing, and a lock nut 16. At the inner end of the shaft, within the casing, is a. cylindrical rotor or impeller 20. The side of this rotor which is at the front of the casing is open and the outer side is closed by a plate or web 2'1 resting against the inner face of the casing wall. Although the cylindrical impeller may in some cases be separate from and connected to the shaft, it may desirably be integral therewith, as shown. There may be a clearance as at 22 between the cylindrical wall of the easing and the cylindrical wall of the rotor or this may be omitted. WVhen such a clearance or chamber'is provided, the casing has an inturned flange 23, the cylindrical face of which overlaps a margin of the rotor.

The inner periphery of the rotor is formed to provide the active pumping elements in cooperation with the non-rotary vane and vane abutment or sealing device. Desirably, these'formations are made in a separate, generally cylindrical piece or ring 24 which may be inserted in the rotor with a press fit. The provision of a separate impeller ring enables it to be made of material diflerent from the other pump parts; as for example, of phosphor bronze when the rotor proper is of steel; and also permits renewal of the impeller ring to compensate for wear after long service. If desired, the impeller or pocket formations to be described may be formed integrally in the rotor itself.

The impeller ring 2st has on its inner face two or more-desirably as shown, three pumping pockets 25. The form or particular curvature of these pockets may vary. In a 1 i A A .a Is iucu-tetrui simple form as shown, they may be arcuate curvature in cross-axial planes, as shown in Fig. 3, the arcs being struck on radii from centers away from the pump axis. Between the pockets are crests or lands 26 ot' substantially part-cylindrical contour and relatively short in the circular direct-ion.

The casing is closed by a front plate 30,

detachably secured as by screws 31, which. in this particular example, engage in flange 23. lVhen necessary, any suitable gasket or packing may be placed under the front plate, against the flange. The cover plate has on its inner face supporting and guiding means for the vane and vane abutment or sealing element. This guide means consists substantially of parallel ribs or flanges 30a. The vane 32, Fig. (5 is slidably mounted between the flanges. In its inward portion, the vane has a spring recess or SOUliCJ 34:. Its outer end is bevelled or rounded as at 35 to cooperate with the impeller surfaces, that is, surfaces of pockets 25 and lands .26. The vane abutment or sealing device, Fig. 5, includes a guide member or slide 36, slidably mounted between flanges 3064. In this slide is a hole or spring socket 3'7, and a helical spring 38 the spring sockets 3A and 37 under suitable compression. The sealing member proper 38a is of curved or part-circula-r contour. If the face is cylindrical, the cylinder radius may be substantially from the axial center of the pump. The sealing menr ber consists substantially of relatively thin flanges or wings 39 extending from a thick ened central portion 40 wherethey are integrally connected to the slide member 36.

The cover plate also has suitable intake and discharge ports or connections. As shown, for this purpose, the plate has on its outer face, bosses 4:5 and 416 bored to provide an intake port 47 and a discharge port 48 respectively. Fluid or liquid is supplied to and discharged through any suitable pipes 50 connected to the ports or bosses by any desirable form of fittings.

Desirably a relief valve provided to unload the pump in the case of excessive back pressure. F or this purpose a valve housing is formed at one of the flanges 30a ant. a valve 56 is guided in this housing to engage a seat 57 surrounding a port 58 passing through the flange opposite ano port or opening 59 in the other flange and communieatingwith the discharge space 60 below the guide structure, as viewed in Fig. 3. A spring 57 of suitable strength to resist a predetermined normal pressure holds the valve on its seat against any lower, or nor mal pumping pressure. The discharge port 48 is positioned opposite this discharge space while the intake port l! positioned opposite the intake space above the guide structure, as readily understood by COEDQEH'lSOll of Figs. 1 and 3.

In operation, as the rotor or impeller 24 revolves, the active :face of the abutment or sealing element is firmly but resiliently held against the faces of one or two of the lands 26 by springs 38, which also maintains the active edge 35 of the vane in contact with the inner surface of the impeller. is the impeller revolves in the direction of the arrow, Fig. 3, one of the pockets 25 advances to the position 25 and in doing so carries a volume of the pumped material (usuanly a liquid) from the intake space past the sealing element, this volume being equal to the cubic volume of the pocket in the position 25, Fig.

3. in further rotation to the position 25", this volume oi? liquid is delivered to the discharge space 60. lit the same time, as one of the lanes passes away from the contact with the edge 2:35 of the vane, the vane moves outward in contactwith the following p surface and a. the nest land :28 approzu l the vane, the volume of the discharge space is decreased by an amount to the volume oi the space at the left in Fig. 53; or as otherwise described, the vane in cooperation with the impeller forces a definite amount of he liquie through the discharge p art as the vane up on the curved face of the pocket winle the nest land 26 a u roachcs the vane ed go.

It will now be understood that the active surface of the sealing elementis always in contact with at least one, and during a gre partoi? the cycle, with two of the lam thus providing an effective seal to insure a practically positive pumping action in cooperating with the sliding vane; that the abutment or sealing member and vane do not rotate but have only a sliding acti-m, the sliding movement of the Sealing element being of course practically negligible but providing sulficient flexibility to maintain it properly in contact with the lands of the impeller even in the case of considerable wear after long service. The rounded, active face of the vane readily follows t ce curved contour of the impeller and wear is very small, the pump bein capable of exceedingly long so vice without repair or replacement of parts; but when replacement is necessary, it is easilymade by substituting a new sea ing element and vane or a new impeller ring The parts may be accurately fitted by practicable machine operations, so that the pump is practically leak-proof, and positive in action, so that it will raise liquid through an empty intake pipe and without priming, a distance of man feet. and will also deliver liquid positively at low or high speed against heavy back pressure.

The relief valve, when provided, relieves the pump of excessive load when the back pressure is excessive, by lay-passing liquid through the guise structure from the dis;- charge to the intake space.

Figs. 8, 9 and 10 shown a modification in which the by-pass or relief valve and passages are arranged in one section of the casing or specifically on the cover plate 306, and not associated directly with the guide fianges 30a, which in this case have no apertures as shown in the previous figures. The cover plate has an extension '20, in upper and lower portions of which the supply and discharge passages 47 and 48 respectively are formed. The extension also has a passage 71 connecting the supply passage 47 with the intake or low pressure chamber within the main casing at one side of the guides 30a, and another passage 72 connecting the discharge passage 48 and the high pressure chamber in the main casing at the other side of the guide flanges. The passages 71 and 72 are connected at their outer ends by another passage 78, at one end of which is a port and valve seat 74 for a needle valve 75, guided in an upper part of the passage by spaced ribs or flanges 76. The valve is held on its seat with desired pressure by a spring 77. The spring is adjusted by a screw 78 passing through a nut 7 9 screwed into the upper end of the passage, with suitable packing 80. Packing may also be provided around the screw, retained by a packing nut 81 engaging a threaded extension 82 of nut 79. The resistance of the relief Valve to back pressure may be controlled at any time by turning the externally accessible head 83 of the adjusting screw. lVhen the back pressure exceeds the amount for which the spring is adjusted, return flow is established through the by-pass circuit comprising the passages 72, 73 and 71, f om the high pressure to the low pressure side of the pump, thus relieving it of excessive load. This arrangement also avoids filling up any of the space in the intake or low pressure chamber of the pump by a valve guide housing, as shown in the previous example.

I claim:

1. A pump comprising a casing, a rotor having impeller formations, non-rotary guide structure, a vane slidably mounted in the guide structure and cooperating with the impeller formations, a sealing element also supported by the guide structure, and means located in the guide structure and urging the vane to reciprocate in contact with the 'impeller formations.

2. A pump comprising a casing, a rotor having impeller formations, non-rotary guide structure, a vane slidably mounted in the guide structure and cooperating with the impeller formations, a sealing element also supported by the guide structure, and means located in the guide structure between the sealing element and the vane and urging the vane to reciprocate in contact with the impeller formations.

3. A pump comprising a casing, a rotor having impeller formations, a non-rotary guide structure, a substantially arcuate sealing element engaging the impeller formations and having a member movably mount ed in the guide structure, a vane movably mounted in the guide structure .and having an active rounded face engaging the impeller formations, and a spring pressed between the sealing element and the van.

i. A pump comprising a generally cylindrical casing, a cylindrical rotor therein having an open face, impeller pockets and lands alternately formed in the inner periphery of the rotor, a casing wall closing the casing at the open side of the rotor, guide flanges on the inner face of said wall, a vane slidably mounted between the flanges and having an active face engaging the impeller pockets and lands, a spring urging the vane to contact with the rotor periphery, and an arcuate sealing member also supported by the flanges.

5. A pump comprising a generally cylindrical casing, a cylindrical rotor therein having an open face, impeller pockets and lands alternately formed in the inner periphery of the rotor, a casing wall closing the casing at the open side of the rotor, guide flanges on he inner face of said wall, a vane slidably mounted between the flanges and having an active face engaging the impeller pockets and lands, a spring urging the vane to contact with the rotor periphery, and a sealing element having its active face engaged with the rotor lands and a member movably mounted between the flanges, the spring being compressed between the sealing element and the vane. I

6. The structure defined in claim 4: with the addition that the pocket and land formations are provided in a separate ring piece inserted in the rotor.

7. The structure defined in claim t with the addition that said casing wall has intake and discharge ports located opposite intake and discharge spaces at opposite sides of the guide structure.

8. The structure defined in claim 4 with the addition that the rotor has a shaft extending through an extension of the casing, provid ing a bearing, and packing for the shaft.

9. A pump comprising a casing, a rotor having impeller formations, a non-rotary guide structure, a vane slidably mounted in the guide structure and cooperating with the impeller lorinations, a sealing element irrevolubly supported and engaging the impeller formations in generally opposite relation to the vane and a relief valve to by-pass material from one side of the guide structure to the other.

10. The structure defined in claim t with the addition of a relief valve to by-pass material from one side of the guide structure to the other.

11. The structure defined in claim 4 with the addition that one of the guide flanges has formed hereon a Valve casing, a poppet Valve therein engaging a seat and controlling lay-passing of material through ports in the 5 flanges from the discharge to the intake side of the flange structure, and a spring normally retaining the valve on its seat.

12. A pump comprising a casing, a rotor having impeller formations, a non-rotary guide structure, a vane slidably mounted in the guide structure and cooperating With the impeller formations, a sealing element irrevolubly supported and engaging the impeller formations in generally opposite relation to the vane, a cover plate for the casing, an eX- tension on the cover plate, a by-pass passage in the extension leading from the high pres sure to the pressure side of the pump and a relief valve in a part of said passage.

13. A pump structure substantially as defined in claim 1, with the addition of a cover plate for the casing, an extension on the cover plate, a lay-pass passage in the extension leading from the high pressure to the pressure side of the pump, and a relief valve in a part of said passage, a spring for the Valve, and externally accessible means for adjusting the spring.

In testimony whereof I affix my signature. JOSEPH V. PETRELLI. 

